The aquarium said: “Timmy was voted naughty penguin of the month as he always tries to steal fish, and knock other penguins out of the way to get the food. He also has a reputation for flicking sand everywhere.

“Betty was the good penguin of the month in June 2017. Generally a well behaved penguin (goody too-shoes), she loves swimming all day which is good for penguins and always waits patiently for her food – not like the others.”

The aquarium said: “The National Aquarium of New Zealand has received many visitors specifically to come and see the penguins due to the popularity of the naughty and good penguin of the month posts on social media.

“These special penguins really have captured the hearts of Facebook followers, and enabled the aquarium to share its conservation messages.”